Abstract
Flotation is a widely used separation process with applications from mineral separation to de-inking of recycled paper, waste water treatment, and solid remediation. In flotation column, bubble surface area flux (Sb) has been reported to describe the gas dispersion properties, and it has a strong correlation with the flotation rate constant. No information is available regarding Sb for coal flotation in column cell. This paper describes the effects of hydrodynamic parameters on Sb by means of a 23 factorial experimental design in designed flotation column using coal slurry. The results showed that Sb increased with increasing superficial gas velocity and frother concentration, but decreased with increasing solid concentration. The main and interaction effects of operating parameters on Sb were evaluated using Yates’ analysis. The statistical model was developed to predict Sb in column flotation cell using experimental data. This paper also presents the development of the statistical model and the validation using a number of additional data sets. There is a good agreement between experimental results and predicted results from the developed model.
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